package com.hoelg.hgc.constants;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.json.JSONArray;
import org.json.JSONException;

import android.util.Log;

public abstract class Utils {

	public static boolean isNullOrEmpty(String value){
		return (value == null || value.length() == 0);
	}

	private static String convToHex(byte[] data) {
		StringBuilder buf = new StringBuilder();
		for (int i = 0; i < data.length; i++) {
			int halfbyte = (data[i] >>> 4) & 0x0F;
			int two_halfs = 0;
			do {
				if ((0 <= halfbyte) && (halfbyte <= 9))
					buf.append((char) ('0' + halfbyte));
				else
					buf.append((char) ('a' + (halfbyte - 10)));
				halfbyte = data[i] & 0x0F;
			} while(two_halfs++ < 1);
		}
		return buf.toString();
	}

	public static String SHA1(String text) throws NoSuchAlgorithmException,
	UnsupportedEncodingException  {
		MessageDigest md = MessageDigest.getInstance("SHA-1");
		byte[] sha1hash = new byte[40];
		md.update(text.getBytes("iso-8859-1"), 0, text.length());
		sha1hash = md.digest();
		return convToHex(sha1hash);
	}

	public static JSONArray parseJSON(String input){
		JSONArray output = null;

		try{

			output= new JSONArray(input);

		}
		catch(JSONException e){
			Log.e("parsingjson_parsejson", "Error parsing data "+e.toString());
		}

		return output;
	}
	
}
